src/example/multi-project/projects/list/src/list/ListFile.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package list;

import java.util.Collection;
import java.util.ArrayList;
import java.io.File;

import static version.Version.register;

public final class ListFile {
  static {
    register("list");
  }

  public static Collection<File> list(File dir) {
    Collection<File> files = new ArrayList<File>();

    return list(dir, files);
  }

  private static Collection<File> list(File file, Collection<File> files) {
    if (file.isDirectory()) {
      for (File f : file.listFiles()) {
        list(f, files);
      }
    } else {
      files.add(file);
    }
    return files;
  }

  private ListFile() {
  }
}